<video id="myvideo{{index}}" data-i={{index}} src="{{item.video_list}}" loop controls="{{false}}" bindtimeupdate="bind_play"></video>

bind_play(e) {
　　var currentTime = parseInt(e.detail.currentTime)
　　var i = e.currentTarget.dataset.i;
　　var name = "myvideo" + i
　　var videoContext = wx.createVideoContext(name, this);
　　if (currentTime == "3") {
　　　　videoContext.seek(0)
　　}
},